#smtp

Apache Log4net is a versatile, feature-rich, efficient logging API and backend for .NET

Official master for the Greenmail project

a mailer library for Rust

Full-featured, multi-account MCP email server for Windows, macOS, and Linux—read, search, organize, and send email via IMAP and SMTP.

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

An OOB interaction gathering server and client library

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

Open-source email API for applications and AI agents. Managed hosting at e2a.dev, or self-host with Docker.

The classic email sending library for PHP

Privacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.

IMAP/SMTP email for AI agents -- read, send, organize folders, and manage attachments across multiple accounts, with auto-discovery.

Written by humans. WTX is a collection of different transport implementations and related tools focused primarily on web technologies.

A cross-platform .NET library for IMAP, POP3, and SMTP.

Your API mocking tool for OpenAPI and AsyncAPI using Go and JavaScript - https://mokapi.io

📮 Email queue extending NodeMailer with multi SMTP transports and horizontally scaled applications support

Managing and delivering notifications within the Virto Commerce platform

Shared Go libraries.

asyncio smtplib implementation

Upyo is a simple and cross-runtime library for sending email messages using SMTP and various email providers. It works on Node.js, Deno, Bun, and edge functions.

A handy library for creating and sending emails in PHP

Mail Analyzing Interface for email bounce: A Ruby library to parse RFC5322 bounce mails and generating structured data as JSON from parsed results. Ruby version of Sisimai: an error mail analyzer.

Flask-Mail adds SMTP mail sending to your Flask applications

A resilient, configurable SMTP email sender

A high-level utility responsible for orchestrating the creation and delivery of templated email messages

A utility to place emails on Service Bus

A .NET thread-safe singleton HttpClient for Resend